Biology - Unit 3 Test
What process(es) is/are required for
phospholipids to flip-flop across the lipid
bilayer?
a. The process requires energy.
b. The process occurs spontaneously, re-
d. The process requires energy and the
quiring no energy.
flippase enzyme.
c. The process requires an enzyme
called flippase.
d. The process requires energy and the
flippase enzyme.
e. The process occurs spontaneously
and requires the flippase enzyme.
What is the major lipid found in mem-
branes?
a. steroids
b. cholesterol d. phospholipids
c. triglycerides
d. phospholipids
e. saturated fatty acids
Movement of molecules down their con-
centration gradient can drive the move-
ment of a different molecule against its
True
concentration gradient.
T/F
A dysfunctional cell lacks a signal pep-
tidase and is unable to cleave the ER
signal sequence from proteins translated
in the ER. What will be the effect on the
cell's proteins? c. There will be a common signal se-
quence at the N-terminus of all integral
a. The cell will have no integral mem- membrane proteins in the plasma mem-
brane proteins. brane.
b. All cellular proteins will have an ER
signal sequence.
c. There will be a common signal se-
quence at the N-terminus of all integral
, Biology - Unit 3 Test
membrane proteins in the plasma mem-
brane.
d. All cellular proteins will become mem-
brane proteins.
e. There will be a common signal se-
quence at the C-terminus of all integral
membrane proteins in the nuclear enve-
lope.
A protein is tightly associated with the
plasma membrane and it can be isolated
by treating the membrane with a strong
detergent. What type of membrane pro-
tein is this?
c. either an integral or a peripheral mem-
a. a peripheral membrane protein brane protein
b. an integral membrane protein
c. either an integral or a peripheral mem-
brane protein
d. neither an integral nor a peripheral
membrane protein
The membrane component(s) primarily
responsible for the structure and function
of plasma membranes is/are
a. glycosylated proteins. b. phospholipids.
b. phospholipids.
c. glycolipids.
d. nucleic acids.
e. cholesterol
Which membrane component is impor-
tant for allowing large, charged mole-
cules to pass through the membrane?
a.peripheral proteins d. transmembrane proteins
b. cholesterol
c. glycosylated lipids
d. transmembrane proteins
e. carbohydrate channels
, Biology - Unit 3 Test
Na+ ion concentrations are higher out-
side the cell than inside the cell. What
type of transport system is required to
move Na+ ions in and out of the cell?
a. Na+ moves into the cell by facilitated
diffusion and out of the cell by active
transport a. Na+ moves into the cell by facilitated
b. Na+ moves in and out of the cell by diffusion and out of the cell by active
simple diffusion transport
c. Na+ moves in and out of the cell by
active transport
d. Na+ moves into the cell by active trans-
port and out of the cell by facilitated dif-
fusion
e. Na+ moves into the cell by facilitated
diffusion and can not move out of the cell
_________ bind two or more ions or mol-
ecules and transport them in opposite
directions across a membrane.
a. Uniporters c. Antiporters
b. Symporters
c. Antiporters
d. Dual transporters
e. Channel pumps
Placing celery sticks in fresh water will
make them more turgid and harder. This
is because
a. the celery is hypotonic to fresh water.
b. the celery is hypertonic to fresh water. b. the celery is hypertonic to fresh water.
c. the celery is isotonic to fresh water.
d. water moves from the celery sticks into
fresh water.
e. salt moves from the water into the
celery sticks.
What process(es) is/are required for
phospholipids to flip-flop across the lipid
bilayer?
a. The process requires energy.
b. The process occurs spontaneously, re-
d. The process requires energy and the
quiring no energy.
flippase enzyme.
c. The process requires an enzyme
called flippase.
d. The process requires energy and the
flippase enzyme.
e. The process occurs spontaneously
and requires the flippase enzyme.
What is the major lipid found in mem-
branes?
a. steroids
b. cholesterol d. phospholipids
c. triglycerides
d. phospholipids
e. saturated fatty acids
Movement of molecules down their con-
centration gradient can drive the move-
ment of a different molecule against its
True
concentration gradient.
T/F
A dysfunctional cell lacks a signal pep-
tidase and is unable to cleave the ER
signal sequence from proteins translated
in the ER. What will be the effect on the
cell's proteins? c. There will be a common signal se-
quence at the N-terminus of all integral
a. The cell will have no integral mem- membrane proteins in the plasma mem-
brane proteins. brane.
b. All cellular proteins will have an ER
signal sequence.
c. There will be a common signal se-
quence at the N-terminus of all integral
, Biology - Unit 3 Test
membrane proteins in the plasma mem-
brane.
d. All cellular proteins will become mem-
brane proteins.
e. There will be a common signal se-
quence at the C-terminus of all integral
membrane proteins in the nuclear enve-
lope.
A protein is tightly associated with the
plasma membrane and it can be isolated
by treating the membrane with a strong
detergent. What type of membrane pro-
tein is this?
c. either an integral or a peripheral mem-
a. a peripheral membrane protein brane protein
b. an integral membrane protein
c. either an integral or a peripheral mem-
brane protein
d. neither an integral nor a peripheral
membrane protein
The membrane component(s) primarily
responsible for the structure and function
of plasma membranes is/are
a. glycosylated proteins. b. phospholipids.
b. phospholipids.
c. glycolipids.
d. nucleic acids.
e. cholesterol
Which membrane component is impor-
tant for allowing large, charged mole-
cules to pass through the membrane?
a.peripheral proteins d. transmembrane proteins
b. cholesterol
c. glycosylated lipids
d. transmembrane proteins
e. carbohydrate channels
, Biology - Unit 3 Test
Na+ ion concentrations are higher out-
side the cell than inside the cell. What
type of transport system is required to
move Na+ ions in and out of the cell?
a. Na+ moves into the cell by facilitated
diffusion and out of the cell by active
transport a. Na+ moves into the cell by facilitated
b. Na+ moves in and out of the cell by diffusion and out of the cell by active
simple diffusion transport
c. Na+ moves in and out of the cell by
active transport
d. Na+ moves into the cell by active trans-
port and out of the cell by facilitated dif-
fusion
e. Na+ moves into the cell by facilitated
diffusion and can not move out of the cell
_________ bind two or more ions or mol-
ecules and transport them in opposite
directions across a membrane.
a. Uniporters c. Antiporters
b. Symporters
c. Antiporters
d. Dual transporters
e. Channel pumps
Placing celery sticks in fresh water will
make them more turgid and harder. This
is because
a. the celery is hypotonic to fresh water.
b. the celery is hypertonic to fresh water. b. the celery is hypertonic to fresh water.
c. the celery is isotonic to fresh water.
d. water moves from the celery sticks into
fresh water.
e. salt moves from the water into the
celery sticks.
